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POWhy does zoomToSpan only sometimes zoom where I expect it to in an Android MapView?
 

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  1. POWhy does zoomToSpan only sometimes zoom where I expect it to in an Android MapView?
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    <p>I have a MapActivity that is meant to display a specific region, defined by instance variables mCenterPoint, mLatSpan and mLongSpan. The Map object has methods to get the center point, as well as the latitude span and longitude span of the map. When the MapActivity is opened, I want it to immediately center on the center point and zoom to the correct span. </p> <p>Here is my onCreate method and my setRegionOfMap method:</p> <pre><code>public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.google_map); mMapView = (MapView) findViewById(R.id.mapview); mMapView.setBuiltInZoomControls(true); setRegionOfMap(); } private void setRegionOfMap(){ mMapView.getController().setCenter(mCenterPoint); mMapView.getController().zoomToSpan(mLatSpan, mLongSpan); } </code></pre> <p>mMap is just an instance of my map object. The center point and spans are always the same value since the data does not change dynamically. About 1/4 - 1/2 of the time the map is zoomed exactly as I expect it to. Yet the rest of the time the map looks centered correctly, except way too far zoomed out. Why would the MapView only zoom some of the time and other times be incorrect? My only theory was that maybe the map isn't totally drawn when the zoomToSpan call occurs, and thus the zoom doesn't register. I haven't been able to test that theory though.</p>
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